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Abstract

By having the manufacturer write a configuration record on its disk drive at a fixed location, the system can read this information and use it for the operation of the drive. In a system that may have different disk drives installed, it is necessary for the system to determine the types of drives installed and their characteristics in order to operate them. It is difficult but possible to do this using a trial and error method of attempting to read on different heads and cylinders. The trial and error approach is not fail-safe because the system cannot tell the difference between the end of a cylinder or a defective head on the cylinder. The solution to this problem is to have the manufacturer write a configuration record on the disk drive at a fixed location.

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United States

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
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Page 1 of 1

Determining the Type and Characteristics of a Disk Drive Installed in a
System

By having the manufacturer write a configuration record on its disk drive at a
fixed location, the system can read this information and use it for the operation of
the drive. In a system that may have different disk drives installed, it is necessary
for the system to determine the types of drives installed and their characteristics
in order to operate them. It is difficult but possible to do this using a trial and
error method of attempting to read on different heads and cylinders. The trial
and error approach is not fail-safe because the system cannot tell the difference
between the end of a cylinder or a defective head on the cylinder. The solution to
this problem is to have the manufacturer write a configuration record on the disk
drive at a fixed location. This configuration record identifies the type of drive
(manufacturer and size) and also contains drive characteristics data. It is then a
simple matter for the system to read this information and save it for later
operation of the drive. A backup configuration record can also be written to a
fixed location to cover the case where the primary configuration record is
unreadable. By having this data written on the drive, the system will know
positively what the file is and its characteristics. The advantages of this
approach are as follows: 1. Faster way of determining the device type and its
characteristics. 2. Prevents the system...